octāvus, a, um, adj. [octo],
I the eighth : octava pars, Cic. Att. 15, 26, 4: legio, Caes. B. G. 2, 23: marmor, the eighth mile-stone , Mart. 9, 65, 4.—
II Subst.: octāva , ae, f.
A (Sc. hora.) The eighth hour of the day , Mart. 4, 8, 5; Juv. 1, 49.—
B (Sc. pars.) The eighth part , as a tax, Cod. Just. 4, 65, 7; Cod. Th. 4, 12, 6; Ulp. Fragm. 6, 12 (cf. octavarius).—
III Adv.: octāvum , for the eighth time , Liv. 6, 36, 7.